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<h1 class="topictitle1">Managing HDFS Copies</h1>
<div><p>This section describes the operations that you can perform on copies on the management page.</p>
<p>You need to log in to the management page and choose <span class="uicontrol"><b><span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839142377_text16175459497"><strong>Explore</strong></span> &gt; <span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839142377_text1017555104914"><strong>Copy Data</strong></span> &gt; <span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839142377_text1483910189532"><strong>Big Data</strong></span> &gt; HDFS</b></span> to go to the HDFS file set copy page.</p>
<ul><li>Click <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol2899165220510"><b>Resources</b></span> to perform operations by resource. Operations on this page are performed on replication copies of the current resource. Perform the following operations in the cluster where the replication copies reside. <p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p1449155317445"><a href="#EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_table108701649347">Table 1</a> describes the related operations.</p>

<div class="tablenoborder"><a name="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_table108701649347"></a><a name="en-us_topic_0000001839143185_table108701649347"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_table108701649347" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Operations related to replication copies</caption><colgroup><col style="width:21.32%"><col style="width:47.339999999999996%"><col style="width:31.34%"></colgroup><thead align="left"><tr id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_row6870349042"><th align="left" class="cellrowborder" valign="top" width="21.32%" id="mcps1.3.3.1.3.2.4.1.1"><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p118701849749">Operation</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="47.339999999999996%" id="mcps1.3.3.1.3.2.4.1.2"><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p1387013498414">Description</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="31.34%" id="mcps1.3.3.1.3.2.4.1.3"><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p12870184910411">Navigation Path</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_row08701149540"><td class="cellrowborder" valign="top" width="21.32%" headers="mcps1.3.3.1.3.2.4.1.1 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p48706491742">Creating protection for replication copies</p>
</td>
<td class="cellrowborder" valign="top" width="47.339999999999996%" headers="mcps1.3.3.1.3.2.4.1.2 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p1087015494412"><strong id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_b13871149741">Scenario</strong></p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p270074703612">This operation enables you to periodically replicate or archive replication copies.</p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p267094031613"><strong id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_b4978171851814">Note</strong></p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p9670184021612">If no replication copy is generated for the selected resource, you cannot associate an SLA with the resource for protection.</p>
</td>
<td class="cellrowborder" valign="top" width="31.34%" headers="mcps1.3.3.1.3.2.4.1.3 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p487194915415">In the row of the target resource, choose <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol287116499413"><b><span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text987116491245"><strong>More</strong></span> &gt; <span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text13521152634220"><strong>Protect</strong></span></b></span> and associate a replication SLA or an archive SLA to replicate or archive replication copies.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_row178717491342"><td class="cellrowborder" valign="top" width="21.32%" headers="mcps1.3.3.1.3.2.4.1.1 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p18713493416">Modifying the SLA associated with replication copies</p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p887110492414"></p>
</td>
<td class="cellrowborder" valign="top" width="47.339999999999996%" headers="mcps1.3.3.1.3.2.4.1.2 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p987134915415"><strong id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_b168711049240">Scenario</strong></p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p287104910419">This operation enables you to modify the SLA associated with replication copies.</p>
</td>
<td class="cellrowborder" valign="top" width="31.34%" headers="mcps1.3.3.1.3.2.4.1.3 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p19871144910419">In the row of the target resource, choose <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol3871749541"><b><span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text287118491849"><strong>More</strong></span> &gt; <span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text125761634164320"><strong>Modify Protection</strong></span></b></span> and associate a new SLA with replication copies.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_row1987112491546"><td class="cellrowborder" valign="top" width="21.32%" headers="mcps1.3.3.1.3.2.4.1.1 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p108711049749">Removing protection for replication copies</p>
</td>
<td class="cellrowborder" valign="top" width="47.339999999999996%" headers="mcps1.3.3.1.3.2.4.1.2 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p88711849945"><strong id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_b1787117491414">Scenario</strong></p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p53695313586">You can remove the protection plan if the replication copies no longer need to be protected. After removal, the system cannot protect these replication copies.</p>
</td>
<td class="cellrowborder" valign="top" width="31.34%" headers="mcps1.3.3.1.3.2.4.1.3 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p15871144920417">In the row of the target resource, choose <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol1871114919419"><b><span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text387144911413"><strong>More</strong></span> &gt; <span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text1571395216438"><strong>Remove Protection</strong></span></b></span>.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_row191077557610"><td class="cellrowborder" valign="top" width="21.32%" headers="mcps1.3.3.1.3.2.4.1.1 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p136950484237">Activating protection for replication copies</p>
</td>
<td class="cellrowborder" valign="top" width="47.339999999999996%" headers="mcps1.3.3.1.3.2.4.1.2 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p86648169242"><strong id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_b4468151716249">Scenario</strong></p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p10694948192314">After the protection plan for replication copies is disabled, you can enable it again. Then, the system protects replication copies based on the protection plan.</p>
</td>
<td class="cellrowborder" valign="top" width="31.34%" headers="mcps1.3.3.1.3.2.4.1.3 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p61071551265">In the row of the target resource, choose <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol06417191616"><b><span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text1631919168"><strong>More</strong></span> &gt; <span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text36491201615"><strong>Activate Protection</strong></span></b></span>.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_row811414581465"><td class="cellrowborder" valign="top" width="21.32%" headers="mcps1.3.3.1.3.2.4.1.1 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p71076551464">Disabling protection for replication copies</p>
</td>
<td class="cellrowborder" valign="top" width="47.339999999999996%" headers="mcps1.3.3.1.3.2.4.1.2 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p842845116222"><strong id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_b1797565114222">Scenario</strong></p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p10107055766">You can disable the protection plan if the replication copies no longer require periodic protection. After the protection plan is disabled, the system does not execute automatic protection jobs of these replication copies.</p>
</td>
<td class="cellrowborder" valign="top" width="31.34%" headers="mcps1.3.3.1.3.2.4.1.3 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p1111475810613">In the row of the target resource, choose <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol1666398101615"><b><span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text366315891610"><strong>More</strong></span> &gt; <span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text16638841619"><strong>Disable Protection</strong></span></b></span>.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_row153332773"><td class="cellrowborder" valign="top" width="21.32%" headers="mcps1.3.3.1.3.2.4.1.1 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p43312218714">Performing manual replication for a replication copy</p>
</td>
<td class="cellrowborder" valign="top" width="47.339999999999996%" headers="mcps1.3.3.1.3.2.4.1.2 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p9940133218250"><strong id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_b109408327259">Scenario</strong></p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p139401328256">This operation enables you to replicate a replication copy immediately.</p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p6763172119279"><strong id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_b17763721122714">Note</strong></p>
<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p781862319279">Before performing this operation, ensure that an SLA based on replication copies has been created and used to create protection for the corresponding resource.</p>
</td>
<td class="cellrowborder" valign="top" width="31.34%" headers="mcps1.3.3.1.3.2.4.1.3 "><p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p1534321671">In the row of the target resource, choose <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol1131310712817"><b><span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text1131315711814"><strong>More</strong></span> &gt; <span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text3372133811441"><strong>Manually Replicate</strong></span></b></span>.</p>
</td>
</tr>
</tbody>
</table>
</div>
</li></ul>
<ul><li>Click <strong>Copy</strong> to perform operations by copy.<p><a href="#EN-US_TOPIC_0000001792397312__en-us_topic_0000001090712911_table51069596392">Table 2</a> describes the related operations.</p>

<div class="tablenoborder"><a name="EN-US_TOPIC_0000001792397312__en-us_topic_0000001090712911_table51069596392"></a><a name="en-us_topic_0000001090712911_table51069596392"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001090712911_table51069596392" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Operations related to HDFS copies</caption><colgroup><col style="width:19.6%"><col style="width:49%"><col style="width:31.4%"></colgroup><thead align="left"><tr><th align="left" class="cellrowborder" valign="top" width="19.6%" id="mcps1.3.4.1.3.2.4.1.1"><p>Operation</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="49%" id="mcps1.3.4.1.3.2.4.1.2"><p>Description</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="31.4%" id="mcps1.3.4.1.3.2.4.1.3"><p>Navigation Path</p>
</th>
</tr>
</thead>
<tbody><tr><td class="cellrowborder" valign="top" width="19.6%" headers="mcps1.3.4.1.3.2.4.1.1 "><p>Restoring a fileset</p>
</td>
<td class="cellrowborder" valign="top" width="49%" headers="mcps1.3.4.1.3.2.4.1.2 "><p><strong>Scenario</strong></p>
<p>This operation enables you to restore an HDFS fileset that has been backed up</p>
</td>
<td class="cellrowborder" valign="top" width="31.4%" headers="mcps1.3.4.1.3.2.4.1.3 "><p>In the row where the copy resides, choose <span class="uicontrol"><b><span><strong>More</strong></span> &gt; <span><strong>Restore</strong></span></b></span>.</p>
<p>The procedure for restoring HDFS filesets is similar to that in <a href="en-us_topic_0000001792397296.html">Restoring HDFS Filesets</a> and is not described here.</p>
</td>
</tr>
<tr><td class="cellrowborder" valign="top" width="19.6%" headers="mcps1.3.4.1.3.2.4.1.1 "><p>Restoring one or more files</p>
</td>
<td class="cellrowborder" valign="top" width="49%" headers="mcps1.3.4.1.3.2.4.1.2 "><p><strong>Scenario</strong></p>
<p>This operation enables you to restore one or more files or directories in an HDFS fileset.</p>
<p><strong>Note</strong></p>
<p>This operation can be performed only when the index status of the copy is <span class="uicontrol"><b>Indexed</b></span>.</p>
</td>
<td class="cellrowborder" valign="top" width="31.4%" headers="mcps1.3.4.1.3.2.4.1.3 "><p>In the row where the copy resides, choose <span class="uicontrol"><b><span><strong>More</strong></span> &gt; <span><strong>File-level Restoration</strong></span></b></span>.</p>
<p>The procedure for restoring one or more HDFS files is similar to that in <a href="en-us_topic_0000001792397344.html">Restoring One or Multiple Files in an HDFS Fileset</a> and is not described here.</p>
</td>
</tr>
<tr><td class="cellrowborder" valign="top" width="19.6%" headers="mcps1.3.4.1.3.2.4.1.1 "><p>Modifying a copy retention policy</p>
<p></p>
</td>
<td class="cellrowborder" valign="top" width="49%" headers="mcps1.3.4.1.3.2.4.1.2 "><p><strong>Scenario</strong></p>
<p>This operation enables you to modify the retention period of a copy.</p>
<p><strong>Note</strong></p>
<p>The modified copy retention period is calculated from the time the modification takes effect.</p>
</td>
<td class="cellrowborder" valign="top" width="31.4%" headers="mcps1.3.4.1.3.2.4.1.3 "><p>In the row where the copy resides, choose <span class="uicontrol"><b><span><strong>More</strong></span> &gt; <span><strong>Modify Retention Policy</strong></span></b></span>.</p>
<p>You can set the retention period to be permanent or to <em>xx</em> days, <em>xx</em> weeks, <em>xx</em> months, or <em>xx</em> years.</p>
</td>
</tr>
<tr><td class="cellrowborder" valign="top" width="19.6%" headers="mcps1.3.4.1.3.2.4.1.1 "><p>Deleting a copy</p>
</td>
<td class="cellrowborder" valign="top" width="49%" headers="mcps1.3.4.1.3.2.4.1.2 "><p><strong>Scenario</strong></p>
<p>This operation enables you to delete a copy to free up storage space if it is not required or becomes invalid.</p>
<p><strong>Note</strong></p>
<ul><li>Before deleting a copy, ensure that the copy is no longer used for restoration.</li><li>Copies in the <span class="uicontrol"><b>Invalid</b></span> state can be deleted, and copies in the <span class="uicontrol"><b><span><strong>Normal</strong></span></b></span> state that have not been indexed or have been indexed can also be deleted. Copies in other states cannot be deleted.</li></ul>
</td>
<td class="cellrowborder" valign="top" width="31.4%" headers="mcps1.3.4.1.3.2.4.1.3 "><p>In the row where the copy resides, choose <span class="uicontrol"><b><span><strong>More</strong></span> &gt; <span><strong>Delete</strong></span></b></span>.</p>
</td>
</tr>
<tr><td class="cellrowborder" valign="top" width="19.6%" headers="mcps1.3.4.1.3.2.4.1.1 "><p>Creating indexes</p>
</td>
<td class="cellrowborder" valign="top" width="49%" headers="mcps1.3.4.1.3.2.4.1.2 "><p><strong>Scenario</strong></p>
<p>This operation enables you to manually create an index for a single copy if you do not enable the automatic index function when creating an SLA. After an index is created, file-level restoration can be performed or files and directories in the copy can be searched for.</p>
<p id="EN-US_TOPIC_0000001792397312__p1192155143814"><strong id="EN-US_TOPIC_0000001792397312__b1015313411371">Note</strong></p>
<p id="EN-US_TOPIC_0000001792397312__p540226203814">Replication copies and copies archived to tapes do not support index creation.</p>
</td>
<td class="cellrowborder" valign="top" width="31.4%" headers="mcps1.3.4.1.3.2.4.1.3 "><p>In the row where the copy resides, choose <span class="uicontrol"><b><span><strong>More</strong></span> &gt; <span><strong>Manually Create Index</strong></span></b></span>.</p>
</td>
</tr>
<tr><td class="cellrowborder" valign="top" width="19.6%" headers="mcps1.3.4.1.3.2.4.1.1 "><p>Performing reverse replication or cascaded replication on replication copies</p>
</td>
<td class="cellrowborder" valign="top" width="49%" headers="mcps1.3.4.1.3.2.4.1.2 "><p><strong>Scenario</strong></p>
<p>This operation enabled you to replicate a replication copy to the source end for data restoration or replicate a replication copy to another cluster for remote DR.</p>
<p><strong>Note</strong></p>
<p>When reverse replication is performed, the copy with the same name at the source end will be overwritten.</p>
</td>
<td class="cellrowborder" valign="top" width="31.4%" headers="mcps1.3.4.1.3.2.4.1.3 "><div class="p">In the row of the target replication copy, choose <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol1262954116166"><b><span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text16291141191616"><strong>More</strong></span> &gt; <span id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_text132798260912"><strong>Replicate</strong></span></b></span>. Configure copy replication parameters.<ol id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_ol15113142311175"><li id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_li0113202310179">Select <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol1611634014176"><b>Replication Target Cluster</b></span>.<ul id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_ul2991182216"><li id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_li3998812219">If <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol630794164212"><b>Replication Target Cluster</b></span> is the source cluster, reverse replication is performed.</li><li id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_li1419217379216">If <span class="uicontrol" id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_uicontrol118058437428"><b>Replication Target Cluster</b></span> is another cluster, cascaded replication is performed.</li></ul>
</li><li id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_li1564916443171">Set the copy retention period.</li><li id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_li6696135771714">Enable or disable data deduplication and compression.<p id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_p325810594214"><a name="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_li6696135771714"></a><a name="en-us_topic_0000001839143185_li6696135771714"></a>You are advised to enable these functions to improve replication efficiency.</p>
</li><li id="EN-US_TOPIC_0000001792397312__en-us_topic_0000001839143185_li3458142216186">Enable or disable the job failure alarm function.</li></ol>
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